2、填22.Whilebuildingatunnelthroughthemountain,________.A.anundergroundlakewasdiscoveredB.therewasanundergroundlakediscoveredC.alakewasdiscoveredundergroundD.theworkersdiscoveredanundergroundlake23.-Whyweren'tyouatthemeeting? -I________foralongdistancecallfrommysisterinAmerica. A.waswaited B.